Abstract:

A reinforcing bar binder capable of certainly identifying the type of a
wire reel and automatically adjusting the amount of feeding of the wire
wound around the wire reel or the twisting torque on the wire is
provided. The reinforcing bar binder feeds a wire while rotating a wire
reel mounted in a storing chamber and binds a reinforcing bar. The
storing chamber is provided with a first detecting means for detecting
the amount of rotation of the wire reel and a second detecting means for
detecting the number of second to-be detecting portions on the wire reel
during the amount of rotation detected by the first detecting means. The
binder main body is provided with controlling means for controlling the
amount of feeding of the wire or the twisting torque on the wire based on
the number of the second to-be-detected portions detected by the second
detecting means.

Claims:

1. A reinforcing bar binder comprising:a storing chamber provided in a
main body of the reinforcing bar binder for mounting a wire reel around
which a wire for binding a reinforcing-bar is wound, the wire being
twisted for binding the reinforcing bar after it is wound around the
reinforcing bar, and the storing chamber being provided with a detecting
device; anda control circuit that judges a detection output of the
detecting device, the detecting device comprising a first detecting
apparatus and a second detecting apparatus; whereinthe first detecting
apparatus comprising a contact-type sensor which contacts at least one
first to-be-detected portion provided on the wire reel to detect an
amount of rotation of the wire reel;the second detecting apparatus
detects at least one second to-be-detected portion provided on the wire
reel passing the second detecting apparatus during the amount of rotation
of the wire reel detected by the first detecting apparatus; andthe
control circuit counts the at least one second to-be-detected portion
detected by the second detecting apparatus.

2. The reinforcing bar binder according to claim 1, wherein the second
detecting apparatus is a non-contact type sensor.

3. The reinforcing bar binder according to claim 1, wherein the control
circuit receives a first signal when the first detecting apparatus
detects the at least one first to-be-detected portion and a second signal
when the first detecting apparatus detects another first-to-be-detected
portion on the wire reel.

4. A wire reel utilized in a reinforcing bar binder comprising a control
circuit and a storing chamber provided in a main body of the reinforcing
bar binder for mounting the wire reel around which a wire for binding a
reinforcing-bar is wound, the wire being twisted for binding the
reinforcing bar after it is wound around the reinforcing bar, whereinthe
storing chamber is provided with a first detecting apparatus comprising a
contact-type sensor and a second detecting apparatus;the wire reel is
provided with a first to-be-detected portion and a second to-be-detected
portion coupled to the control circuit;the first detecting apparatus
contacts the first to-be-detected portion to detect an amount of rotation
of the wire reel; andthe second to-be-detected portion passing the second
detecting apparatus during the amount of rotation of the wire reel
detected by the first detecting apparatus is counted by the control
circuit.

5. The wire reel according to claim 4, wherein the second detecting
apparatus is a non-contact type sensor.

6. A wire-reel identifying method utilized with a reinforcing bar binder
comprising a storing chamber provided in a main body of the reinforcing
bar binder for mounting a wire reel around which a wire for binding a
reinforcing-bar is wound, the wire being fed by rotating the wire reel
and being twisted for binding the reinforcing bar after it is wound
around the reinforcing bar, the method comprising:detecting with a first
detecting apparatus comprising a contact-type sensor an amount of
rotation of the wire reel, wherein the first detecting apparatus contacts
a first to-be-detected portion provided on the wire reel;detecting with a
second detecting apparatus a second to-be-detected portion provided on
the wire reel during rotation of the wire reel detected by the first
detecting apparatus; andcounting the second to-be-detected portion
detected by the second detecting apparatus.

7. The wire-reel identifying method according to claim 6, wherein the
second detecting apparatus is a non-contact type sensor.

8. A wire-reel identifying method comprising:providing a first
to-be-detected portion and a second to-be-detected portion on a wire
reel;detecting the first to-be-detected portion with a first detecting
apparatus comprising a contact-type sensor to detect an amount of
rotation of the wire reel, wherein the first detecting apparatus contacts
a first to-be-detected portion;detecting the second to-be-detected
portion with a second detecting apparatus during rotation of the wire
reel; andcounting with a control circuit the second to-be-detected
portion detected with the second detecting apparatus to detect a type of
the wire reel.

9. The wire-reel identifying method according to claim 8, wherein the
second detecting apparatus is a non-contact type sensor.

Description:

RELATED APPLICATIONS

[0001]This application is a continuation of application Ser. No.
10/550,595, filed Jun. 22, 2006, which claims priorities under 35 U.S.C.
§119 to Japanese Application No. 2004-004816, filed Jan. 9, 2004,
and under 35 U.S.C. §371 to PCT Application No. PCT/JP2004/016922,
filed as an International Application on Nov. 8, 2004, designating the
U.S., the entire contents of which are hereby incorporated by reference
in their entireties.

TECHNICAL FIELD

[0002]The present invention relates to a reinforcing bar binder capable of
identifying the type of a wire reel and automatically adjusting the
amount of feeding of a wire wound around the wire reel or the twisting
torque on the wire, a wire reel used therewith and a method for
identifying a wire reel.

BACKGROUND ART

[0003]In a conventional reinforcing bar binder, a wire reel around which a
wire is wound is retained at the rear portion thereof and, when the
switch is turned on and a trigger is manipulated, the wire is drawn out
and fed forward from the wire reel through a wire feeding device,
discharged in a loop shape from the tip end curved portion of a guide arm
and wound onto a reinforcing bar and, thereafter, a twisting hook grips a
portion of the loop and torsionally rotates to bind the reinforcing bar.
As a configuration for automatically adjusting the wire twisting torque
of such a reinforcing bar binder, there has been a configuration which
provides displaying means for displaying the type of a wire on the side
surface of a wire reel, employs detecting means provided on the
reinforcing bar binder for detecting the displaying means, identifies the
type of the wire on the basis of the result of detection from the
detecting means and automatically adjusts the twisting torque, as
disclosed in JP-B No. 3050369.

[0004]A conventional reinforcing bar binder employs reflective stickers as
the displaying means and a plurality of photo sensors as the detecting
means so that any of the plural sensors can detect the reflective
stickers provided on the side surface of the wire reel to detect the type
of the wire reel. However, such a reinforcing bar binder requires plural
photo sensors, thus involving a complicated and expensive construction.
Furthermore, the reflective stickers may be detected by photo sensors
other than the photo sensors used for detecting the reflective stickers,
due to the rotation speed of the wire reel and external disturbing light
and the like, which has caused malfunctions in some cases.

[0005]The present invention was made in view of the aforementioned
problems. It is a first object of the present invention to provide a
reinforcing bar binder capable of certainly identifying the type of a
wire reel and automatically adjusting the amount of feeding of the wire
wound around the wire reel or the twisting torque on the wire while
having a simple and inexpensive construction. Further, it is a second
object to provide a wire reel used with the reinforcing bar binder.
Further, it is a third object to provide a method for certainly
identifying a wire reel.

OBJECTS AND SUMMARY

[0006]For achieving the aforementioned first object, a reinforcing bar
binder according to a first aspect of the present application is a
reinforcing bar binder including a storing chamber which is provided in a
binder main body and mounts a wire reel around which a reinforcing-bar
binding wire is wound to wind said wire around a reinforcing bar and then
to twist said wire for binding of said reinforcing bar, wherein the
storing chamber is provided with a first detecting means for detecting
the amount of rotation of the wire reel and a second detecting means for
detecting the number of second to-be-detected portions on the wire reel.

[0007]For achieving the aforementioned first object, a reinforcing bar
binder according to a second aspect of the present application is a
reinforcing bar binder including a storing chamber which is provided in a
binder main body and mounts a wire reel around which a reinforcing-bar
binding wire is wound to wind said wire around a reinforcing bar and then
to twist said wire for binding of said reinforcing bar while rotating
said wire reel to feed said wire, wherein the storing chamber is provided
with a first detecting means for detecting the amount of rotation of said
wire reel and a second detecting means for detecting the number of second
to-be-detected portions on the wire reel during the amount of rotation
detected by the first detecting means; and the binder main body is
provided with controlling means for controlling the amount of feeding of
the wire or the twisting torque on the wire depending on the number of
the second to-be-detected portions detected by the second detecting
means.

[0008]For achieving the aforementioned first object, in the reinforcing
bar binder according to a third aspect of the present application, the
first detecting means detects first to-be-detected portions on the wire
reel to detect the amount of rotation of the wire reel.

[0009]For achieving the aforementioned first object, in the reinforcing
bar binder according to a fourth aspect of the present application, the
first detecting means is a contact-type sensor and the first
to-be-detected portions are convex portions or concave portions which are
detected by the contact-type sensor while the second detecting means is a
non-contact type sensor and the second to-be-detected portions are marks
which are detected by the non-contact type sensor.

[0010]For achieving the aforementioned second object, a wire reel
according to a fifth aspect of the present application is a wire reel
used in a reinforcing bar binder including a storing chamber which is
provided in a binder main body and mounts a wire reel around which a
reinforcing-bar binding wire is wound to wind said wire around a
reinforcing bar and then to twist said wire for binding of said
reinforcing bar, wherein the reel main body is provided with first
to-be-detected portions which are detected by a first detecting means in
the reinforcing bar binder and second to-be-detected portions which are
detected by a second detecting means in the reinforcing bar binder

[0011]For achieving the aforementioned second object, in the wire reel
according to a sixth aspect of the present application, the first
to-be-detected portions are detected by the first detecting means to
detect the amount of rotation of the wire reel and the second
to-be-detected portions are detected by the second detecting means to
identify the type of the wire reel.

[0012]For achieving the aforementioned second object, in the wire reel
according to a seventh aspect of the present application, the first
detecting means is a contact-type sensor and the first to-be-detected
portions are convex portions or concave portions which are detected by
the contact-type sensor while the second detecting means is a non-contact
type sensor and the second to-be-detected portions are marks which are
detected by the non-contact type sensor.

[0013]For achieving the aforementioned third object, a wire-reel
identifying method according to eighth aspect of the present application
is a wire-reel identifying method used in a reinforcing bar binder
including a storing chamber which is provided in a binder main body and
mounts a wire reel around which a reinforcing-bar binding wire is wound
to wind said wire around a reinforcing bar and then to twist said wire
for binding of said reinforcing bar while rotating said wire reel to feed
said wire, wherein the amount of rotation of the wire reel is detected
and the number of to-be detected portions provided on the wire reel is
detected during the detected amount of rotation of the wire reel for
identifying the type of the wire reel.

[0014]For achieving the aforementioned third object, in the wire-reel
identifying method according to ninth aspect of the present application,
the amount of feeding of the wire or the twisting torque on the wire is
adjusted in accordance with the identified type of the wire reel.

[0015]For achieving the aforementioned third object, a wire-reel
identifying method according to tenth aspect of the present application
is a wire-reel identifying method used in a reinforcing bar binder
including a storing chamber which is provided in a binder main body and
mounts a wire reel around which a reinforcing-bar binding wire is wound
to wind said wire around a reinforcing bar and then to twist said wire
for binding of said reinforcing bar while rotating said wire reel to feed
said wire, first to-be-detected portions provided on the reel main body
are detected by a first detecting means for detecting the amount of
rotation of the wire reel; and the number of second to-be detected
portions provided on the wire reel is detected by a second detecting
means during the detected amount of rotation of the wire reel for
identifying the type of the wire reel.

[0016]For achieving the aforementioned third object, in the wire-reel
identifying method according to a eleventh aspect of the present
application, the first detecting means is a contact-type sensor and the
first to-be-detected portions are convex portions or concave portions
which are detected by the contact-type sensor while the second detecting
means is a non-contact type sensor and the second to-be-detected portions
are marks which are detected by the non-contact type sensor.

BRIEF DESCRIPTION OF THE DRAWINGS

[0017]FIG. 1 is a general view illustrating the general outline of a
reinforcing bar binder according to the present invention.

[0018]FIG. 2 is a perspective view of the reinforcing bar binder wherein
the cover is removed.

[0019]FIG. 3 is a top view of the reinforcing bar binder wherein the cover
is removed.

[0020]FIG. 4 is a top cross-sectional view of the reinforcing bar binder
wherein the cover is removed.

[0021]FIG. 5 is a right side view of the reinforcing bar binder wherein
the cover is removed.

[0022]FIG. 6 is a back side cross-sectional view of the reinforcing bar
binder wherein the cover is mounted.

[0023]FIG. 7 is a perspective view of the reinforcing bar binder wherein
the wire reel of FIG. 2 is removed.

[0024]FIG. 8 is a top view of the reinforcing bar binder wherein the wire
reel of FIG. 3 is removed.

[0025]FIG. 9 is a top cross-sectional view of the reinforcing bar binder
wherein the wire reel of FIG. 4 is removed.

[0026]FIG. 10 is an explanation view illustrating the state where the
cover is mounted.

[0027]FIG. 11 is a right side view of the reinforcing bar binder wherein
the wire reel of FIG. 5 is removed.

[0028]FIG. 12 is a back side cross-sectional view of the reinforcing bar
binder wherein the wire reel of FIG. 6 is removed.

[0030]FIG. 14 is a left side cross-sectional view of the reinforcing bar
binder.

[0031]FIG. 15 is a perspective view of the wire reel.

[0032]FIG. 16 is an explanation view of the wire reel, wherein (a) is a
front view of the wire reel, (b) is a cross-sectional view taken along
A-A of (a) and (c) is a cross-sectional view taken along B-B of (a).

[0033]FIG. 17 is an explanation view of the wire reel, wherein (a) is a
back view of the wire reel, (b) is a side view and (c) is a
cross-sectional view taken along C-C of (b).

[0034]FIG. 18 is an explanation view of the state where the wire reel is
mounted.

[0035]FIG. 19 is a flow chart illustrating the operation of the
reinforcing bar binder.

BEST MODE FOR CARRYING OUT THE INVENTION

[0036]A reinforcing bar binder 1 includes a storing chamber 70 which is
provided in a binder main body 2 and mounts a wire reel 30 around which a
reinforcing-bar binding wire 8 is wound, as illustrated in FIG. 1 and
FIG. 2. The reinforcing bar binder 1 feeds the wire 8 while rotating the
wire reel 30, winds the wire 8 around a reinforcing bar 3 and then twists
it to bind the reinforcing bar 3. In the storing chamber 70, there are
provided a first detecting means 80 for detecting the amount of rotation
of the aforementioned wire reel 30 and a second detecting means 25 for
detecting the number of second to-be-detected portions 53 on the wire
reel 30 during the amount of rotation detected by the first detecting
means 80. In the binder maim body 2, there is provided a control means
for controlling the amount of feeding of the wire 8 or the twisting
torque on the wire 8, on the basis of the number of the second
to-be-detected portions 53 detected by the second detecting means 25.

[0037]The first detecting means 80 detects the amount of rotation of the
wire reel 30 by detecting first to-be-detected portions 65 on the wire
reel 30, as illustrated in FIG. 18. The first detecting means 80 may be a
contact-type sensor and the first to-be-detected portions 65 may be
convex portions or concave portions which can be detected by the
contact-type sensor 80 while the second detecting means 25 may be a
non-contact type sensor and the second to-be-detected portions 53 may be
marks which can be detected by the non-contact type sensor 25.

[0038]The wire reel 30 is used in the reinforcing bar binder 1 in which
the wire reel 30 around which the reinforcing-bar binding wire 8 is wound
is mounted in a storing chamber 70 provided in the binder main body 2,
the aforementioned wire 8 is wound around the reinforcing bar 3 and then
twisted to bind the reinforcing bar 3, as illustrated in FIG. 2. The reel
main body 30a is provided with the first to-be-detected portions 65 which
are detected by the first detecting means 80 of the reinforcing bar
binder 1 and the second to-be-detected portions 53 which are detected by
the second detecting means 25 of the reinforcing bar binder 1.

[0039]The first to-be-detected portions 65 are detected by the first
detecting means 80 so that the amount of rotation of the wire reel 30 is
detected while the second to-be-detected portions 53 are detected by the
second detecting means 25 so that the type of the wire reel 30 is
identified. The first detecting means 80 maybe a contact-type sensor and
the first to-be-detected portions 65 may be convex portions or concave
portions which can be detected by the contact-type sensor 80 while the
second detecting means 25 may be a non-contact type sensor and the second
to-be-detected portions 53 may be marks which can be detected by the
non-contact type sensor 25.

[0040]The method for identifying the wire reel 30 is used in the
reinforcing bar binder 1 in which the wire reel 30 around which the
reinforcing-bar binding wire 8 is wound is mounted in the storing chamber
70 provided in the binder main body 2, the wire is fed while the
aforementioned wire reel 30 is rotated, the wire 8 is wound around the
reinforcing bar 3 and then twisted to bind the reinforcing bar 3, as
illustrated in FIG. 7. The first to-be-detected portions 65 provided on
the reel main body 30a are detected by the first detecting means 80 so
that the amount of rotation of the wire reel 30 is detected while the
number of the second to-be-detected portions 53 provided on the reel main
body 30a is detected by the second detecting means 25 during the detected
amount of rotation of the wire reel 30 so that the type of the wire reel
30 is identified.

[0041]The method for identifying the wire reel 30 enables adjusting the
amount of feeding of the wire 8 or the twisting torque on the wire 8, on
the basis of the identified type of the wire reel 30. The first detecting
means 80 may be a contact-type sensor and the first to-be-detected
portions 65 may be convex portions or concave portions which can be
detected by the contact-type sensor 80 while the second detecting means
25 may be a non-contact type sensor and the second to-be-detected
portions 53 may be marks which can be detected by the non-contact type
sensor 25.

[0042]The reinforcing bar binder 1 will be described in detail. The
reinforcing bar binder 1 includes a pair of abutting plate portions 5
which abut against the reinforcing bar 3 at the lower portion of the
front end portion of the binder main body 2 which faces the reinforcing
bar 3 and further includes a twisting hook 7 having a wire-inserting
groove 6 at the tip end portion thereof between the pair of abutting
plate portions 5. The twisting hook 7 can be rotated by an electric motor
9. The twisting hook 7 stays at a position spaced apart from the wire 8
with the wire inserting groove 6 faced in parallel with the loop-shaped
wire 8 during standby prior to the start of the rotation of the electric
motor 9, in order to facilitate the insertion of the wire 8 curved in a
loop shape into the wire-inserting groove 6.

[0043]The twisting hook 7 is held on the electric motor 9 through a
forward/backward moving mechanism 10. The forward/backward moving
mechanism 10 is constituted by a cam mechanism, for example. The
forward/backward moving mechanism 10 inserts the wire 8 into the wire
inserting groove 6 of the twisting hook 7 at the start of the rotation of
the electric motor 9 and pulls back the twisting hook 7 to the standby
position when the rotation of the electric motor 9 is stopped. Namely,
when a trigger 11 is pulled to start the rotation of the electric motor
9, the twisting hook 7 extends towards the wire 8 to insert the wire 8
into the wire-inserting groove 6, rotates by a predetermined amount, and
then stops to return to the original standby position.

[0044]The binder main body 2 includes a wire path 12 for passing the wire
8 therethrough. The wire path 12 extends from the rear end portion of the
binder main body 2 up to a guide portion 15 which bends the wire so as to
be easily wound. The guide portion 15 is curved in an arc shape and the
wire path 12 forms a groove opened at the arc inner portion at the guide
portion 15. A gear 17 mounted on the output shaft of a motor 16 is
provided on the wire path 12 at the middle position of the binder main
body 2. The gear 17 is exposed at an opening portion (not shown) which is
provided in the wire path 12 and the gear 17 presses the wire 8 against
the bottom portion of the wire path 12. The motor 16 and the gear 17
constitute the feeding device for the wire 8 and the wire 8 is fed
forward through the normal rotation of the motor 16.

[0045]When a micro switch 20 is turned on through the trigger 11, the
motor 16 is caused to rotate, thus rotating the wire feeding gear 17.
Through the rotation of the wire feeding gear 17, the wire 8 wound around
the wire reel 30 which is housed within the storing chamber 70 is fed to
the forward portion of the binder main body 2 through the wire path 12 in
the guide portion 15. Further, the normal and reverse rotation of the
motor 16 may be controlled by a control circuit (not shown) incorporated
in the binder main body 2 such that, for example, the wire 8 is wound
around the reinforcing bar 3 in a loop shape and thereafter the wire 8 is
pulled on the wire reel 30 towards the storing chamber 70 to reduce the
looseness in the wire 8.

[0046]At the portion of the wire path 12 which reaches the guide portion
15, there is provided a wire gripping/cutting means 21. The wire
gripping/cutting means 21 is constituted by, for example, a pair of
gripping portions and a pair of cutting blades such that the wire 8
passes between the pair of gripping portions and between the pair of
cutting blades. The wire gripping/cutting means 21 causes the pair of
cutting blades to contact and intersect with each other to cut the wire 8
when the feeding amount of the wire 8 reaches a predetermined amount, on
the basis of the amount of the rotation of the motor 16. Thereafter, the
end portion of the wire 8 is gripped by the pair of gripping portions,
and the wire 8 wound around the reinforcing bar 3 in a loop shape is
twisted by the twisting hook 7 with the rear end portion of the loop
gripped by the pair of gripping portion to bind the reinforcing bar 3.

[0047]At the rear portion of the binder main body 2, there is formed the
storing chamber 70 for housing the wire reel 30 around which the wire 8
is wound. Prior to description of the storing chamber 70, the wire reel
30 will be described on the basis of FIGS. 15 to 17. The wire reel 30 is
made of a plastic such as an ABS resin, polyethylene or polypropylene
which has excellent resistance to wear and bending, and made of a black
plastic in order to prevent the entry of external disturbing light into a
hub portion 31. The wire reel 30 is constituted by the hub portion 31 for
winding the wire 8 therearound and disk-shaped flanges 32 and 33 provided
at the opposite sides of the hub portion 31. The hub portion 31 is formed
to have a cylindrical shape and is formed integrally with the pair of
flanges 32, 33. Engaging pawls 34 are formed around the outer periphery
of one flange 32.

[0048]The hub portion 31 includes an inner cylinder 40, which is
substantially coaxial with the hub portion 31, at the center portion
thereof and a mounting hole 45 for inserting a reel mounting shaft 23 of
the reinforcing bar binder 1 thereinto inside the inner cylinder 40. The
inner cylinder 40 is formed to be shorter than the hub portion 31 and one
end 41 thereof is positioned near the flange 32 while the other end 42 is
formed to be slightly beyond the substantial middle position of the hub
portion 31. The other end 42 is coupled to the hub portion 31 through a
side wall 46. The side surface 43 of the side wall 46 closer to the
flange 33 and the inner surface 47 of the hub 31 define a round concave
portion 49.

[0049]On the side surface 43 of the side wall 46 closer to the flange 33,
there are provided a pair of fixation shafts 50, 50 protruding opposite
to each other. The tip ends 51 of the fixation shafts 50 are extended to
the vicinity of the flange 33 and are provided with a fitting hole 52.
The marks 53 are fitted within the fitting holes 52. The marks 53 are
made of a white plastic in order to increase the amount of light which is
reflected and received, and are constituted by a fitting shaft 55 to be
fitted in the fitting hole 52 and a reflection plate 56 formed at the tip
end of the fitting shaft 55. A gently-curved concave portion 57 is formed
on the surface of each of the reflection plates 56. The pair of fixation
shafts 50, 50 are housed within the concave portions 49.

[0050]A ring-shaped boss portion 58 is formed on the flange 33 to surround
the round concave portion 49. The boss portion 58 includes a tapered
surface 60 at the outer peripheral edge 59 thereof and a stepped concave
portion 62 at the inner peripheral edge 61 thereof. The stepped concave
portion 62 has a depth which substantially reaches the tip ends of the
aforementioned fixation shafts 50, 50. Further, a pair of protrusions 65,
65 are formed opposite to each other on the outer peripheral edge 59 of
the boss portion 58. The protrusions 65, 65 are formed to have a
trapezoid shape and include inclined edges 66, 66 at their opposite
sides.

[0051]While the protrusions 65, 65 are placed at substantially the same
angles as the aforementioned fixation shafts 50, 50, the positional
relationship between the protrusions 65, 65 and the fixation shafts 50,
50 is not limited thereto. Further, while the two fixation shafts 50, 50
are employed in the present embodiment, the number of the fixation shafts
is not limited thereto and may be one, or three or more. Further, a boss
portion 67 similar to that on the flange 33 is also provided on the
flange 32 such that it is opposite to the aforementioned boss portion 58.

[0052]Further, a cylindrical hole 68 which enables the detection of the
rotational position of the wire reel 30 is formed through the side wall
46. A light emitting device and a light receiving device may be placed
within the region of the rotation of the hole 68 in the reinforcing bar
binder 1 such that the hole 68 passes between the both devices to enable
the determination of the condition of the rotation of the wire reel 30.
There are formed substantially sector-shaped patterns, which are
strengthening ribs of the thinned flanges 32, 33, around the outer
peripheral edges of the flanges 32, 33.

[0053]In the flange 32, a wire-inserting opening portion 35 is formed to
extend from the outer peripheral edge to the hub portion 31. The winding
termination end of the wire 8 is engaged and held within the
wire-inserting opening portion 35. A wire-inserting hole 36 is formed
through the hub portion 31 and the inner cylinder 40. The winding
starting end of the wire 8 is inserted and held within the wire-inserting
hole 36. When winding the wire 8, the winding starting end of the wire 8
is inserted into the wire-inserting hole 36 and is wound within the inner
cylinder 40 to prevent the winding starting end from pulling out of the
wire-inserting hole 36 and, in this state, the winding of the wire around
the peripheral surface of the hub 31 is started. Further, in the event
that the wire 8 is subjected to a large force in the direction of
winding, the tensile force can be received at the edge portion of the
wire-inserting opening portion 35.

[0054]The storing chamber 70 of the reinforcing bar binder 2 can be
covered with a cover member 22 which is secured to one side thereof
through hinge coupling, as illustrated in FIG. 10. The cover member 22 is
provided with a reel mounting shaft 23 which is freely projected and
recessed and is fitted in the mounting hole 45 in the wire reel 30. The
cover member 22 is provided with a reel stopper 24 which locks the reel
mounting shaft 23 with the reel mounting shaft 23 protruded (set) into
the storing chamber 70. The storing chamber 70 is constituted by a front
wall 72, a bottom wall 73 and a side wall 75, as illustrated in FIG. 7.
On the side wall 75, there is formed a round-shaped protruding portion 76
which is fitted in the step concave portion 62 of the wire reel 30. A
non-contact type sensor (optical sensor, interrupter) 25 is provided in
the protruding portion 76. When the protruding portion 76 is fitted in
the step concave portion 62, as illustrated in FIG. 18, the entry of
light into the concave portion 49 is prevented and also the entry of
external disturbing light into the interrupter 25 is avoided. The optical
sensor 25 is constituted by a light emitting device and a light receiving
device, and the marks 53 to be detected by the optical sensor 25 include
a curved concave portion 57 at their upper ends so that light emitted
from the light emitting device is concentrated to the light receiving
device, which enables certain detection of the marks 53.

[0055]A sensor placing hole 77 is formed in the protruding portion and the
reflection-type interrupter 25 which is the aforementioned non-contact
type sensor is installed as an optical sensor within the sensor placing
hole 77. The optical sensor 25 is connected to the aforementioned control
circuit, which feeds electricity to the interrupter 25 and receives
output signals from the interrupter 25. The control circuit detects the
marks 53 on the wire reel 30 from output signals from the interrupter 25.
The control circuit detects the number of the marks 53 by detecting the
change in the output voltage from the interrupter 25.

[0056]The contact sensor (first detecting means) 80 is provided on the
side wall 75 of the storing chamber 70 above the protruding portion 76.
The contact sensor 80 is a mechanical switch and is constituted by a
swayable member 82 which is swayably provided on a supporting shaft 81, a
contact piece 83 provided at the tip end of the swayable member 82, an
elastic member 85 which biases the contact piece 83 towards the wire reel
30, a magnet portion 86 provided at the other end of the swayable member
82 and a Hall IC 87 with which the magnet portion 86 is brought into
contact by the elastic member 85.

[0057]The switch which is the contact sensor (first detecting means) 80 is
provided within the binder main body 2, and the contact piece 83 is
protruded from an opening portion 78 formed in the side wall 75. The
protrusions (first to-be-detected portions) 65 on the reel main body 30a
come into contact with the contact piece 83. In the switch which is the
contact sensor (first detecting means) 80, when the protrusions (first
to-be-detected portions) 65 on the reel main body 30a come into contact
with the contact piece 83, the swayable member 82 is swayed against the
elasticity of the elastic member 85, thereby separating the magnet
portion 86 from the Hall IC 87.

[0058]The contact sensor (first detecting means) 80 is connected to the
aforementioned control circuit so that electrical signals caused by the
voltage change in the Hall IC 87 are sent to the control circuit. The
control circuit detects the rotation of the wire reel 30 from electrical
signals from the contact sensor (first detecting means) 80. When the
control circuit does not detect a change in the voltage from the contact
sensor (first detecting means) 80 within a predetermined time period, the
control circuit determines that the wire reel 30 is not rotated and
causes light emission from an LED or the like provided on the side
surface of the reinforcing bar binder 1 or warning-sound generation to
inform the operator of the termination of the wire 8 on the wire reel 30.

[0059]Also, when the wire reel 30 is not normally set, such as when the
setting of the reel mounting shaft 23 or the reel stopper 24 in FIG. 10
is forgotten, there is the possibility of disengagement of the wire reel
30 from the protruding portion 76 during rotation. Further, there is the
possibility of falling or fling of the wire reel 30 from the storing
chamber 70 depending on the orientation of the reinforcing bar binder
main body 2. In this case, the contact piece 83 of the contact sensor
(first detecting means) 80 can detect the disengagement of the wire reel
30 from the protruding portion 76, thus enabling informing the operator
of the abnormal rotation of the wire reel 30 through light emission from
an LED or the like or warming-sound generation.

[0060]Further, on the front wall 72, there is provided an elastic piece 89
which engages with the aforementioned engaging pawls 34 on the wire reel
30 to stop the rotation of the wire reel 30. The elastic piece 89 does
not work during the feeding of the wire. At the completion of the feeding
of wire, the elastic piece 89 acts to apply a brake to the wire reel 30
due to the activation of the electric motor 9. An opening 90 for drawing
out the wire 8 is formed through the front wall 72 at the upper portion
thereof. The opening 90 is communicated with the wire path 30.

[0061]In the reinforcing bar binder 1 having the aforementioned structure,
the wire reel 30 is housed and mounted within the storing chamber 70
(step 101). The step concave portion 62 of the wire reel 30 is fitted
with the protruding portion 76 formed on the side wall 75 of the storing
chamber 70, and the reel mounting shaft 23 provided on the cover member
22 is protruded into the storing chamber 70 to insert the reel mounting
shaft 23 into the mounting hole 45 of the reel main body 30a. At this
state, the reel mounting shaft 23 is locked by the reel stopper 24. The
wire 8 around the wire reel 30 is drawn out and the drawn tip end portion
is fed to the wire path 30 through the opening 90 of the front wall 72
and placed on the gear 17 of the feeding device. Since the protruding
portion 76 is fitted in the step concave portion 62 of the wire reel 30,
the concave portion 49 of the inner cylinder 40 is shielded from light,
thus preventing the entry of external disturbing light into the
interrupter (the second detecting means, the non-contact sensor) 25
within the concave portion 49. The marks (second to-be-detected portions)
53 provided on the fixation shafts 50 in the wire reel 30 rotate near the
interrupter (second detecting means) 25 in the protruding portion 76 with
a predetermined interval left therebetween and reflect light from the
interrupter (second detecting means) 25.

[0062]After mounting the wire reel 30 in the reinforcing bar binder 1 as
described above (step 101), when a main switch which is not shown is
turned on (step 102), the control circuit is initialized (step 103) and
the motor 16 of the feeding device is caused to rotate, thus causing the
rotation of the wire feeding gear 17 so that the tip end of the wire 8
wound around the wire reel 30 which is housed within the storing chamber
70 is fed to a predetermined position. When the micro switch 20 is turned
on through the trigger 11 (step 104), the motor 16 is caused to rotate,
thus causing the rotation of the wire feeding gear 17 to start
measurement of the amount of feeding of the wire 8 (step 105). Through
the rotation of the wire feeding gear 17, the wire 8 wound around the
wire reel 30 housed within the storing chamber 70 is fed to the forward
portion of the binder main body 2 through the wire path 12 in the guide
portion 15. Further, the control of the rotation of the motor 16 is
performed by a control circuit (not shown) which is incorporated in the
binder main body 2.

[0063]While the wire 8 is fed forward, the wire reel 30 is rotated, thus
bringing the protrusions (first to-be-detected portions) 65 on the reel
main body 30a into contact with the contact piece 83 of the contact
sensor (first detecting means) 80. When the protrusions (the first
to-be-detected portions) 65 on the reel main body 30a come into contact
with the contact piece 83, the swayable member 82 sways against the
elasticity of the elastic member 85 to separate the magnetic portion 86
from the Hall IC 87, and consequently, pulse signals are caused by the
voltage change and sent to the control circuit. The control circuit
starts counting the pulses to detect the protrusions (first
to-be-detected portions) 65 (step 106). The control circuit performs the
detection of the protrusions (first to-be-detected portions) 65 for a set
time period (step 107) and, when they are not detected, namely when no
pulse signal is sent within the set time period, the control circuit
determines that the wire reel 30 is not rotated and causes light emission
from the LED or the like provided on the side surface of the reinforcing
bar binder 1 or warning-sound generation (step 108).

[0064]When the protrusions (the first to-be-detected portions) 65 are
detected within the set time period, namely when pulse signals caused by
the voltage change are sent to the control circuit, the control circuit
recognizes that the wire reel 30 is rotated while the interrupter (second
detecting means, non-contact sensor) 25 directs light thereto, detects
reflected light from the marks (second to-be-detected portions) 53
provided on the fixation shafts 50 in the wire reel 30 (step 109) to
detect the marks 53 and then sends detection signals to the control
circuit. Thus, the control circuit counts the number of the marks 53
(step 110). After the first protrusion (first to-be-detected portion) 65
comes into contact with the contact piece 83 of the contact sensor 80,
when the next protrusion (first to-be-detected portion) 65 comes into
contact with the contact piece 83 of the contact sensor 80 and thus is
detected (step 111), pulse signals are sent to the control circuit and
then the detection is terminated (step 112). Further, the control circuit
calculates the number of the marks (second to-be-detected portions) 53
which have been detected by the interrupter (second detecting means,
non-contact sensor) 25 to identify the wire reel 30 (step 113).

[0065]Since the protrusions (first to-be-detected portions) 65 are
provided on the reel main body 30a such that they are opposed to each
other as previously described, the amount of rotation is 1/2 turn (180
degrees) and the type of the wire reel 30 is identified from the number
of the marks 53 during the amount of rotation. The control circuit sets
the energization time period for the motor 16 of the feeding device and
the electric power supplied to the electric motor 9. When the first
detecting means 80 does not detect the next protrusion (first
to-be-detected portion) 65 within a predetermined time period (step 115),
the control circuit determines that the wire reel 30 is not rotated and
causes light emission from the LED or the like provided on the side
surface of the reinforcing bar binder 1 or warning-sound generation (step
116).

[0066]After the detection of the amount of rotation of the wire reel 30,
when no mark 53 has been detected during the amount of rotation (step
117) or when the number of marks 53 which have been detected during the
amount of rotation is equal to or more than a predetermined value, for
example, three (step 118), the control circuit causes light emission from
the LED or the like provided on the side surface of the reinforcing bar
binder 1 or warning-sound generation (step 119, step 120). The control
circuit identifies the type of the wire reel 30 on the basis of the
number of the detected marks 53 and sets the amount of feeding of the
wire 8 depending on the number of rotations (the angle of rotation) of
the wire feeding gear 17 and the twisting torque depending on the
electric power supplied to the electric motor 9. For example, when the
number of detected mark 53 is one (step 121), the control circuit sets an
amount A of feeding of the wire 8 and a twisting torque A on the wire 8
(step 122). Further, when the number of detected marks 53 is two (step
123), the control circuit sets an amount B of feeding of the wire 8 and a
twisting torque B on the wire 8 (step 124).

[0067]The aforementioned detection is rapidly performed and the wire 8 is
fed forward along the guide portion 15 without causing interruption of
the wire 8. After the identification of the type of the wire reel 30, the
marks 53 or the protrusions 65 serve as a reel rotation detecting means
and the marks 53 or the protrusions 65 start the detection of rotation of
the wire reel 30 (step 125). The elapsed time T1 since a mark 53 or a
protrusion 65 was detected last until the next mark 53 or protrusion 65
is detected is longer than an error determination time period T2 (a set
time period) (step 126), the control circuit determines that the wire
reel 30 is not rotated and causes light emission from the LED or the like
provided on the side surface of the reinforcing bar binder 1 or
warning-sound generation (step 127).

[0068]When the aforementioned T1 is shorter than T2 (step 126), the wire 8
is fed by the amount set depending on the type of the wire reel 30 and
wound around the reinforcing bar 3 in a loop shape. When the amount of
wire which has been fed does not reach the set amount of feeding A or B
(step 128), the process returns to the step 126. When the amount of the
wire 8 which has been fed reaches the set amount of feeding A or B (step
128), the feeding of the wire is terminated (step 129) and the wire is
cut. Thereafter, the wire is twisted by the twisting torque A or B of the
electric motor 9 which has been set depending on the type of the wire
reel 30 and thus the reinforcing bar 3 is bound (step 130). Consequently,
the reinforcing bar binder 1 can automatically adjust the amount of
feeding of the wire 8 or the twisting torque thereon in accordance with
the thickness, characteristics and the like of the wire 8.

[0069]While in the aforementioned embodiment the two marks 53 (second
to-be-detected portions) 53 are provided on the wire reel 30, it is
obvious that a single, three or more marks may be provided thereon.
Further, while the marks 53 are made of a while plastic, they may be
reflective stickers. While the two protrusions (first to-be-detected
portions) 65 are provided on the wire reel 30, it is obvious that a
single, three or more protrusions may be provided thereon.

[0070]For example, in the event that the wire reel 30 is not normally set
within the storing chamber 70 in the aforementioned reinforcing bar
binder 1, when the first detecting means 80 is a non-contact type sensor
such as an optical sensor, the first detecting means 80 may response to
light other than the reflected light from the first to-be-detected
portions of the wire reel 30 and to external disturbing light, and may
detect it as normal rotation. However, the reinforcing bar binder 1 which
has been described in the aforementioned embodiment employs a
contact-type sensor as the first detecting means 80 and, therefore, even
when the wire reel 30 is not normally set within the storing chamber 70,
it will not detect the wire reel 30, thus enabling detection of the
abnormal state.

[0071]Further, while the non-contact type sensor (optical sensor,
interrupter) 25 for detecting the marks (second to-be-detected portions)
53 on the wire reel 30 is provided as the second detecting means within
the storing chamber 70 of the binder main body 2, the second
to-be-detected portions may be concave portions or convex portions
instead of marks and the second detecting means may be contact sensors
(switches) so that the type of the wire reel can be identified by the two
contact sensors. Further, while the contact sensor (switch) 80 for
detecting the protrusions (first to-be-detected portions) 65 on the wire
reel 30 is provided as the first detecting means within the storing
chamber 70 of the reinforcing main body 2, the first to-be-detected
portions may be marks instead of convex portions and concave portions,
and the first detecting means may be anon-contact type sensor (optical
sensor, interrupter) so that the type of the wire reel 30 may be
identified by the two non-contact type sensors.

EFFECTS OF THE INVENTION

[0072]With the reinforcing bar binder 1 according to the present
invention, the amount of rotation of the wire reel is detected by the
first detecting means and the number of the to-be-detected portions of
the wire reel is detected by the second detecting means, thus providing
the advantage that the type of the wire reel can be identified and the
feeding amount of the wire wound around the wire reel or the twisting
torque for the wire can be controlled. More specifically, the detection
of the amount of rotation of the wire reel is performed by detecting the
first to-be-detected portions on the wire reel with the first detecting
means and, when the first to-be-detected portions are convex portions or
concave portions, a contact-type sensor may be employed as the first
detecting means, thus providing the advantage that the first
to-be-detected portions can be certainly detected.

[0073]The wire reel used in the reinforcing bar binder according to the
present invention includes the first to-be-detected portions which are
detected by the first detecting means of the reinforcing bar binder and
the second to-be-detected portions which are detected by the second
detecting means of the reinforcing bar binder, wherein there are provided
the advantages that the amount of rotation thereof is detected by
detecting the first to-be-detected portions with the first detecting
means and the type of the wire reel is detected by detecting the second
to-be-detected portions with the second detecting means. More
specifically, the first to-be-detected portions may be convex portions or
concave portions which are detected by the contact type sensor and the
second to-be-detected portions may be marks which are detected by the
non-contact type sensor, which provides the advantage that the type of
the wire reel can be certainly identified. Further, there is provided the
advantage that a user can identify the type of the wire reel only by
looking the aspect of the second to-be-detected portions (for example,
the number of marks) on the wire reel.

[0074]The method for identifying a wire reel used in the reinforcing bar
binder according to the present invention detects the amount of rotation
of the wire reel and detects the number of to-be-detected portions
provided on the wire reel during the detected amount of rotation of the
wire reel, thus providing the advantage that there is no need for the
wire-reel rotation speed and the wire-reel operating time as the factors
for identifying the wire reel. Consequently, even if the wire reel
rotates at a significantly high or low speed, it is possible to identify
the wire reel. Further, there is no need for detecting the number of the
to-be-detected portions within a driving time period of the wire-reel,
and therefore it is possible to perform certain identification. By
identifying the type of the wire reel, it is possible to automatically
adjust the amount of feeding of the wire or the twisting torque for the
wire, thus providing the advantage that manual adjustments are
unnecessary.